The 25-year-old has been linked with the likes of Arsenal, Tottenham, Manchester United and Barcelona in recent months.
But the Belgium international still has another year to run on his Ajax contract.
He told Voetbal Primeur: “Everyone has already made their peace with the fact that I’ve gone, but I’ve not gone yet.
“I have a year left on my contract and I haven’t decided anything. I’m still at Ajax.”
